In the field of psychotherapy, active ingredients such as Fluoxetine, commonly known by its brand name Prozac, are essential for treating depression and anxiety disorders. Fluoxetine is a selective serotonin reuptake inhibitor (SSRI), meaning it works by increasing the levels of serotonin, a neurotransmitter associated with mood regulation, in the brain. This mechanism helps to alleviate symptoms of depression and improves overall emotional well-being.